Hey strangers (sorry no friends yet) i am SupremeTime and i will make an attempt to reach 1 BTC from 1 mbtc.
I think some books reduced their betting minimum to 0.1 mbtc. That might be a good starting point, better than 1 mbtc on reduced risk. With betting it could be more about percentage gains than unit gains. Many hedge fund managers only manage a 5% ROI(return on investment). If a gambler can consistently deliver greater than 5% returns, they're essentially ahead of the game.
I've seen some gamblers like Vegas Dave have more than 5 TV's mounted on one wall and they have sports games playing on every single tv which they watch and analyze simultaneously. At the upper end of the spectrum things can get crazy with sports betting.
The best I've done is 16x what I started with. But that's a very aggressive strategy which may not be sustainable. The best strategy could be to bet between 1% and 5% increments of your bankroll and try to win via attrition and hope you come out on top with a positive win / loss record. At least that's the strategy I see a lot of people use and be successful with. High returns might be correlated with high losses. There have been times when I've doubled my money in one day but being that aggressive makes it easy to take big losses, playing things safer could be the way to go.